Maybe I wasn't all that clear. I receive emails on my phone while outlook is closed on my comp. then as soon as I load outlook on my comp. my emails on my phome disappear. Everything its set to pop 3 and not Ms exchange which is what I first thought. Hope this clarifies a little.
That does clarify a bit.
So the issue is, your mail is being taken off the server by Outlook and your phone (even as POP3) is not downloading the mail to your phone, or, during a sync, it is seeing the mail gone and not keeping it on your phone.
Unless your mail client has a setting that lets you keep the mail regardless of the state of the messages on the server, kinda out of luck for a "one in all" solution.
I hope someone can come up with a better idea, but this is what I would suggest.
1. Setup Outlook to NOT remove messages from the server when you check your mail
2. Create a local .pst file on your home computer (aka Outlook Data File)
3. Any messages you do NOT want left on the server (like the ones with huge attachments), move them over to the PST and they should delete from the server since they are no longer in your inbox. If not, then delete them from your phone and the phone will update the server, but you should not have to do this, the don't remove from server is only on check.
--You might even be able to make an outlook rule.
The rule should look like:
Apply this Rule after the message arrives
(from step 1)
which has an attachment
(from step 2)
Move it to the
specified folder (Select a folder in your PST File)
Click through the rules wizard and be sure to turn the rule on.
This way, when you check your mail, it will automatically MOVE the mail from the Inbox (server) to your PST file if it has an attachment.
Now, if you want to get all fancy, you can in step 3 of the rules wizard to specify mail size... so you get an attachment and it is small, it will stay, but larger ones will get moved.
Play around, you can tweak rules quite a lot to get them to do what you want them to to.
Hope this helps!